Examples · Reconstitution
Worked example
Reconstitution - practice problem 6
The prescriber orders 125 mg of methylprednisolone IV. The vial directs: add 1 mL of diluent to yield 40 mg/mL.
Ordered dose125 mg
After reconstitution40 mg/mL
Diluent1 mL
How many milliliters should the nurse draw up?
Answer: 3.13 mL
Step-by-step solution
1. Read the concentration after reconstitution
Add 1 mL diluent → 40 mg per 1 mL
2. Set up dimensional analysis so mg cancels
125 mg × ( 1 mL ÷ 40 mg )
3. Cancel mg and solve
= 125 ÷ 40 mL
= 3.13 mL
More reconstitution examples